mikaela.github.io/_layouts/blog_by_tag.html

<h1>Articles by tag :{{ page.tag }}</h1>
<div>
    {% if site.tags[page.tag] %}
        {% for post in site.tags[page.tag] %}
            <a href="{{ post.url }}/">{{ post.title }}</a>
        {% endfor %}
    {% else %}
        <p>There are no posts for this tag.</p>
    {% endif %}
</div>